Tag:low polluted water source

№9|2014

DRINKING WATER SUPPLY

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UDC 628.16.052.2

Alekseeva L. P., Alekseev S. E., Kourova L. V.

Optimization of low polluted water purification process

Summary

The ways of enhancing water coagulation processes at the operating water treatment plants with the purpose of reducing chemical costs are considered. The results of studying the conditions of different coagulants and floculants use in water purification from low polluted sources by the example of the Irtysh River are presented. It was stated that during both summer-fall and winter periods the use of aluminium oxychloride coagulant in combination with organic coagulants was most efficient for Irtysh water treatment. The effect and optimal parameters of mixing chemicals with water in the mixing chamber and flocculation tank is shown. The optimal conditions of water mixing in the mixing chamber during the summer period provided for reducing the turbidity of clarified water and filtrate by 20 and 35%, respectively; whereas enhancing slow mixing in the flocculation tank – by 35 and 63%, respectively. Du­ring the fall period the effect of mixing conditions is even higher and allows reducing the chemical dosage applied minimum twofold while maintaining the qua­lity of treated water. In winter when water treatment at the plant is actually carried out in contact coagulation mode the represen­ted data show that the optimal conditions of rapid mixing water with coagulants in the mixing chamber provide for the treated water turbidity 3–5 times lower compared to the treatment under the existing conditions even at lower dosages. It is shown that for low turbidity and low colored water reducing the chemical dosage requires more rapid and long-lasting water mixing in flocculation tanks.

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№2|2019

145th ANNIVERSARY OF THE MINSK WATER SUPPLY SYSTEM

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UDC 628.16.065.2

Akhmadieva Iu. I., Sazanova N. I.

Estimation of the efficiency of aluminum-containing coagulants
in low polluted surface water treatment through
the example of «Minskvodokanal» UE

Summary

«Minskvodokanal» UE has been continuously developing the technologies of water treatment with the purpose of improving drinking water quality and water supply services. One of the perspective directions of improving the technologies of surface water treatment at the Water Treatment Plant of Minsk is the search for new efficient chemicals, coagulants based on aluminium salts in particular. The data describing the quality of natural water incoming for treatment is presented. The process flow scheme of water treatment is presented. The issues of objective estimation of the efficiency of the chemicals studied are considered with obtaining consistent results proved under production conditions. The main controlled parameters of natural water and water after coagulant addition are determined, and the measurement techniques are presented. The experimentel results and technical process modeling under laboratory conditions is shown. A general program of laboratory tests of aluminum-containing coagulants has been compiled. The method of data processing and analysis with obtaining statistically consistent results has been developed. The periods of testing new coagulant brands that provide for taking account of the seasonal and annual fluctuations of the chemical and microbiological water components for selecting coagulants that are efficient throughout the year are denoted.

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